This one is really simple: if you want or need an ultra-wide-angle zoom for your FX-body that delivers the highest performance with a professional build and a constant f2.8 aperture there's only one choice: The Nikon AF-S 14-24mm f2.8G! This lens thus clearly earns a Highly Recommended rating.
Below I have listed the good and bad points of the Nikon 14-24/2.8G for you.

The Nikon 14-24mm /2.8G is an excellent wide-angle pro lens, with only two substantial flaws: lens flare, and the inability to attach filters. The lens hood does work to prevent flare if you can put it between the front element and the sun, but let's face it - this is a wide angle lens we're talking about. Optical performance is excellent, mounted on either an APS-C or 35mm frame, but corner...